Ana Chem Flashcards
It is the determination of Organic Nitrogen in a solution
Kjeldahl Method
Mixture of weak acid/base and their conjugate
buffer solution
It is the quantity of strong acid or base needed to cause 1L of the buffer to undergo a pH change of 1
buffer capacity
A solution is basic if:
a. [OH-] > 0
b. [OH-] = 1×10^-77M
c. [OH-]> [H+]
d. [ОН-] > 1×10^-7M
c
Water at room temperature usually has a slightly acidic pH. This is largely attributed to what compound(s)?
a. Sulfuric acid
b. Dissolved metals
c. Carbonic acid
d. Nitric acid
c
watee hardness - calcium carbonate
Define a salt in terms of acid and base.
a. salt is a compound that follows Le Chatelier’s Principle in reactions with other compounds.
b. All of these
C. A salt is a compound formed when the nucleus of a hydrogen tom enters a quantity of water.
d. A salt is a compound (other than water) produced by the reaction of an acid and a base.
d
HCl + NaOH —> NaCl + H2O
When a can of soda is opened and CO2 is released to the atmosphere, what is the resultant pH of the soda?
a. Decreases
b. Increases
c. The same
d. All these
b
pag nabawasan acidity, pH will increase
inc CO2 = dec pH
Which of the following pairs will form a buffer solution in the course of a titration?
a. Nitric acid, sodium hydroxide
b. Sulfuric acid, potassium hydroxide
c. Acetic acid, sodium hydroxide
d. Hydrochloric acid, potassium hydroxide
c
Buffer capacity is maximum when:
a. рН = 0.5pKa
b. pH = pKa
c. pH = 2pKa
d. pH = 0.1pKa
b
Which of the following acids would be most suitable for preparing a buffer of pH 3.1?
a. Hydrogen peroxide, pKa = 11.65
b. Propanoic acid, pKa = 4.874
c. Cyanoacetic acid, pKa = 2.472
d. Sulfanilic acid, pKa = 3.232
d
nearest to 3.1
complexing agent
a. ligand
b. complex ion
c. chelating agent
d. coordination number
c
• Ligand or coordinating agent: the molecule or ion containing the donor atom.
• Coordination compound or complex ion: the product resulting from the reaction between a metal ion and a ligand
• Coordination number: the number of pairs of electrons accepted by a particular metal ion (at least 4, often 6)
